The aim of this textbook is to provide in-depth information about the various applications and uses of sensors and actuators. It is designed in such a way that it provides the readers thorough insights about this subject. Sensors and actuators is an interface which is used for networking solutions. It is designed to connect sensors, rotary encoders, valve position sensors and actuators, etc. using single 2-conductor cable. It mainly provides functional safety in machinery and emergency stop applications. This book is a compilation of chapters that discuss the most vital concepts in the field of sensors and actuators. It presents this complex subject in the most comprehensible and easy to understand language. While understanding the long-term perspectives of the topics, the text makes an effort in highlighting their impact as a modern tool for the growth of the discipline. For all those who are interested in this field, this textbook can prove to be an essential guide.